Starting with version 3, there is a single user interface called just:control. During the setup, the administrator can define which one of the two available user interfaces just:live or just:play should be used for a certain channel.
Just Playout v3.0: Important Information
What's New in Just Playout v3.0, v3.1
just:live is a user interface optimised for Live Productions. It streamlines the Playout of Videos and Realtime Graphics in any Live Environment while maintaining full Control over the Situation. → Visit the official product website to learn more!
just:live v3.0 Getting Started
just:live v3.0 User Interface Manual
Just Playout v3.0 Administrator Manual
just:play is a 24/7 Automated Broadcast Playout Server user interface. It plays Videos in SD, HD and UHD, integrates Live Feeds, Router + GPI Events and Realtime Graphics. → Visit the official product website to learn more!
just:play v3.0 Getting Started
just:play v3.0 User Interface Manual
Versions prior to 2.0 can be found in the LEGACY USER MANUALS section.